His activities are based essentially in Switzerland, (intense collaboration with Swiss Radios leading to the commission for OYAMA, a piece created by "L’orchestre de la Suisse Romande" lead by Fabio Luisi, the German creation took place in the Gewandhaud Leipzig, the first US perfomance will be in Dallas), Paris (commission for a composition for Radio France, Festival Présences), Russia (Festivals in St. Petersburg, and Moscow, founding of the SPECTRUM Ensemble with Swiss and Russian musicians), and in Leipzig (commissions and productions for the MDR and MDR-Sommer). His works have been performed in the USA, Canada, China, Malaysia, Korea, Japan and throughout Europe. Three times pieces of J-L.Darbellay were included in the program of the World Music Day (Bucarest, Luxemburg and Hong Kong).